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Effects of Climate Change on Marine Ecosystems David Mountain US CLIVAR Science Symposium 14 July 2008.

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Presentation on theme: "Effects of Climate Change on Marine Ecosystems David Mountain US CLIVAR Science Symposium 14 July 2008."— Presentation transcript:

1 Effects of Climate Change on Marine Ecosystems David Mountain US CLIVAR Science Symposium 14 July 2008

2 US GLOBEC Program Effect of Climate Change on Marine Ecosystems Process oriented Physics-Plankton-Fish Regional Programs Given climate predictions, predict ecosystem response Application to fishery management

3 Outline: - Effects of climate change on Ecosystems - Climate parameters desired by Ecosystems - Ecosystem-CLIVAR collaborations

4 Effects of Climate Change on Marine Ecosystems General: Warming - shifting species distributions - corals – bleaching ENSO frequency, strength Low dissolved Oxygen (‘dead zones’) Loss of sea ice Ocean acidification

5 Northwest Atlantic – Gulf of Maine/Georges Bank Two major inflows: Scotian Shelf Water (blue arrow) (cold, fresh) Slope water (red arrow) (warm, saline) Change in SSW inflow

6 NW Georges Bank Salinity Anomaly (0-30m) Decrease in salinity during the 1990’s Increased Scotian Shelf inflow

7 Georges Bank salinity anomaly Zooplankton community structure (Kane, 2007) Zoo X-Coordinate R / Egg Hatched Haddock 1 st Year Survival vs Zoo-X Ecosystem Response to Salinity Changes

8 Salinity Anomaly & Labrador Current Transport Origin of Low Salinity? O 18 indicates high latitude source Labrador current transport (one year lag) Gulf Stream movement Rossby’s north wall of the Gulf Stream All part of large-scale response of the ocean to climate forcing

9 Northeast Pacific Regime Shifts 1976-1977 Major changes in many physical and biological parameters PDO (Pacific Decadal Oscillation – 1 st mode of SSTa) (Peterson and Schwing, 2003)

10 Actually 2 modes of variability: - PDO - North Pacific Gyre Oscillation (NPGO) PDO NPGO 1 st mode of SSTa 2 nd mode of SSHa PDO – single gyre + Alaska gyre - California Current NPGO – two gyres + Alaska Coastal Current + California Current (Di Lorenzo et al, 2008)

11 Di Lorenzo et al. (2008) – ROMS model of the N. Pacific Ocean, forced by NCEP winds and heat flux, with an NPZD for 1950-2004 Response in coastal system to large scale, regional forcing.

12 Delayed Upwelling in 2005 North (48 N) South (33 N) Delay in seasonal production cycle Adverse affect on young salmon survival Closure of salmon fishing in 2008 (Schwing et al., 2006) Upwelling Seasonal timing is important !

13 Important points: Continental shelves are important (..very important…) Climate changes elsewhere can be advected into the region Stratification and vertical processes important Timing within a season can be important

14 Decadal Climate Predictions What ‘Marine Ecosystems’ would want to know: The ‘usual suspects’ – Winds Ocean temperature Ocean circulation Precipitation (and river discharge) The ‘not-so-usual suspects’ Major atmospheric & oceanic indices (ENSO, PDO, NPGO, NAO, AO, ….)

15 and … The “…hard, but critical…” needs – Resolve continental shelves (horizontal) (coastal-scale oceanic and met conditions) Resolve ocean surface layer (vertical) (upwelling, stratification, convection….)

16 Other considerations: “When you’re dead …. you’re dead.” Variability often more important than the mean (e.g., salmon & delayed upwelling) Range, probability distribution for critical parameters Important for application to decision processes

17 Ecosystem – CLIVAR Collaborations Topics areas: Spatial resolution for shelves – nesting fine scale models horizontal and vertical resolution Including biology coupled bio-physical models

18 Regions: Northeast Pacific – Gulf of Alaska & N California Current (following Di Lorenzo et al. 2008) North Atlantic – Basin-scale changes and fish ‘BASIN’

19 Resolving the impact of climatic processes on ecosystems of the North Atlantic basin and shelf seas. ( Courtesy of Peter Wiebe, WHOI) BASIN is an initiative to develop a joint EU/North American ocean ecosystem research program. BASIN: Basin-scale Analysis, Synthesis, and Integration.

20 Concerning application of results: The science is: Transition to application is: this hard - Involve a ‘manager’ from the beginning - Keep expectations modest

21 The End


23 Low Dissolved Oxygen ‘Dead zones’ – many areas around the world Land derived nutrients + increased stratification Off Oregon – deeper upwelling (lower O 2 + nutrients) stratification residence time on shelf (?) Pre-2000 + 2000-2005 (green) + 2006 (red) (Chan et al., 2008)

24 Probability … could be important for management applications Zoo X - Coordinate R / Egg Hatched Haddock Survival Probability of bad years ahead? Protect the stock

25 Increase in Oceanic Low Productivity Areas Surface chl-a < 0.07 mg/m3 Increasing area Increasing SST Likely increasing stratification (Polovina et al., in press)

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